摘要
制备了多壁碳纳米管修饰玻碳电极（MWCNT/GCE）,研究了该电极对米吐尔的电催化作用及测定溶液中米吐尔的分析条件.实验表明：在常见的支持电解质中,米吐尔在MWCNT/GCE上比裸玻碳电极（GCE）上氧化还原峰电位差要小,而峰电流显著增加,因此该电极对米吐尔有电催化作用;在pH=1.0的HCl-KCl支持电解质中,米吐尔的电流响应最佳;扫速增加,峰电流增加,但峰电位受溶液电阻的影响而发生位移,峰形变差,最佳扫描速度为0.12 V/s;一些常见物质对测定无干扰,米吐尔浓度与峰电流的关系为：Ipc=0.1126C＋1.393×10^-4（r=0.9982）;共存的对苯二酚（HQ）干扰测定,但可通过二次微分CV曲线方法消除干扰,在8.0×10^-2～1.0×10^-5mol/L范围内,其浓度与二次微分还原峰面积线性关系为：Apc=8.562×10^-4C＋1.801×10^-6（r=0.9986）;检出限达5.0×10^-6 mol/L.
The preparation of multi-wall carbon nanotube modifyied glassy carbon electrode （MWCNT/GCE） and its electrocatalytic action to metol and analytical condition of metol in the solution were studied. The results indicate that metol redox peak potential difference is smaller on the MWCNT/GCE than that on the bare GCE, but peak current greatly increases in the common support electrolyte, in a word, the electrode can catalyze metol and it is optimal in pH = 1.0 HCl-KCl support electrolyte. The peak increases with the increase of scan rate, but the peak potential may move and the peak shape becomes bad by the affect of solution resistance, so the optimal scan rate is 0. 12 V/s. Some common matters do not effect determination of metol, the Ipc is linearly related to metol concentration, which obeys the equation Ipc =0. 1126C ＋ 1. 393×10^-4（ r =0.9982）. The concomitant hydroquinone affects metol detection, but can eliminate the interference through 2nd order derivative to cyclic voltammetric curve. The results indicate the area of cathodic peak＇s 2nd order derivative is proportional to the metol concentration in the range of 8.0×10^-2～1.0×10^-5mol/L, which obeys the equation Apc = 8. 562×10^-4C ＋ 1. 801×10^-6（ r = 0.9986）and the detection limit can reach 5.0×10^-6 moL/L.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2006年第3期375-378,共4页
Chinese Journal of Analytical Chemistry
基金
四川省教育厅重点研究课题项目(No.2004A106)
关键词
多壁碳纳米管
修饰电极
米吐尔
二次微分
Multi-wall carbon nanotubes, modified electrode, metol, second derivative voltammetry
